JPH08284951A - Needle roller bearing and manufacture of needle roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance stability by improving a needle roller bearing supporting a shaft without play and having a thin wall needle roller bearing sleeve provided with a rotation surface curve part which is capable of elastically flexible deforming and deviates from circle in at least one circumference part. SOLUTION: Collars 2, 18 of a needle roller bearing sleeve 1 are consistently connected to an end face of the needle roller bearing sleeve 1. Each of the collars 2, 18 comprises a uniform width in a radial direction in spite of a shape deviated from a circle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle roller bearing for supporting a shaft without play, which is a thin wall (duenn-wandig) bearing.
Has a rolling surface curved portion which is elastically deformable and deviated from a circular shape in at least one circumferential section, and at least one of the needle rollers (rolling elements) has a rolling surface curvature. Radially preloaded between the part and the rolling surface opposite it, the needle roller sleeve is received in a cylindrical bore and is directed radially inward on the end face The present invention relates to a type having a collar and a method for manufacturing the needle roller bearing.

[0002]

2. Description of the Prior Art Bearings of the above type have been known for a long time. Due to the off-round shape, a defined preload is exerted on the shaft via the needle rollers, so that the shaft is supported without play. Needle roller bearings of this type are known, for example, from DE 2337309 C2. A disadvantage of this needle roller bearing is that the collar facing the inside of the needle roller bearing is not connected to the bearing sleeve (Lagerhuelse) over the entire circumference, but only in sections. In other words,
In a given circumferential section, there is a gap (Schlitz) between the collar and the bearing sleeve when viewed in longitudinal section of the bearing, which gap adversely affects the stability of such a bearing.

[0003]

SUMMARY OF THE INVENTION The object of the invention is therefore to improve a needle roller bearing of the type mentioned at the outset and to increase its stability.

[0004]

In order to solve the above-mentioned problems, in the structure of the present invention, the brim is connected to the end surface of the needle roller sleeve in a consistent manner (durchgehend), and even if it is out of the circular shape. It has a uniform radial width.
The collar bounded radially inward on one side and joined over the entire circumference, and the same radial width of the collar on the other side act so that the needle roller sleeve has a high rigidity (Steifigkeit). This is particularly important for the stability in the circumferential section where the needle roller sleeve and the hole for receiving the needle roller sleeve do not contact each other.

In the arrangement according to claim 2, the needle roller sleeve preferably has a rolling surface curve deviating from the circular shape in three circumferential sections. Of course, the present invention is not limited to such a triangular structure of the needle roller sleeve, and a geometric polygon having n points is also conceivable, but the triangular embodiment is a manufacturing technique. Best to look at. In the structure according to the third aspect, the needle rollers are oriented parallel to the axis by the cage.

In the manufacturing method according to the fourth aspect of the present invention, a small bowl-shaped rotationally symmetrical drawn product having one bottom and one peripheral wall is formed from a disc by a single-stage or multiple-stage deep drawing process. , In this case the peripheral wall has a reduced wall thickness on the side opposite to the bottom, and then the bottom is punched out, thereby forming the first collar and then the peripheral wall with a reduced wall thickness. At the cut area, and then the peripheral wall is bulged at the reduced wall thickness area, thereby forming a second brim, which is chopped by the piercing process and then of the deformation of the drawn product. Afterwards, the cage with the slits and the needle rollers installed is fitted into the needle roller sleeve that is out of the circular shape, and in this case, the deformation is performed in the middle of the rotationally symmetric deep drawing product. The diameter of the Like rollers and corresponds to the middle of the circumferential line of the sleeve, this needle roller sleeve as a collar of uniform width despite the shape deviating from the circular, is performed by. Deformation of the rotationally symmetrical drawn product out of the circular shape is carried out by pressing the sleeve into a suitably shaped mold. Such deformation takes place in the region of plasticity and is therefore permanent.

In order to further improve the mechanically deformed needle roller sleeve, according to the method of claim 5,
Needle roller sleeves are martensite quenched prior to cage engagement.

The manufacturing method according to claim 6 differs from the manufacturing method according to claim 4 by using a closed rolling bearing cage instead of the slit rolling bearing cage. ing. As already stated in claim 4, a bowl-shaped rotationally symmetrical drawing product having one bottom and one peripheral wall is first formed from a disc by a single-step or multi-step deep drawing process. , In this case the peripheral wall has a reduced wall thickness on the side opposite the bottom. The bottom is then punched out and the peripheral wall is then cut in the area of reduced wall thickness. Then, unlike the method according to claim 4, a cage fitted with needle rollers is fitted, the peripheral wall is flanged in the region of reduced wall thickness, and then the needle roller sleeve is needle-shaped. After deformation to a non-circular shape, including the rollers and the cage, it is entirely quenched, in which case the intermediate diameter of the rotationally symmetric deep-drawn product is the intermediate diameter of the deformed needle roller sleeve. Corresponding to the circumference, so that the needle roller sleeve has a collar of uniform width despite its non-circular shape,
Deformation takes place.

By means of the seventh aspect, instead of deep drawing, another manufacturing method without cutting is used, for example pressing or extrusion.

In a further manufacturing method according to claim 8, the compressive stress (Druckeigenspannung) of the needle roller sleeve is increased by grinding (Gleitschleifen) or radiation (Strahlen) after quenching the needle roller sleeve. Such compressive stresses are opposite to Hertzian stresses and reduce the effective shear and tensile stresses in the material. The defined compressive stresses, which have been adapted to the height and the course of stresses, are produced by means of a radiating device such as is commonly used in the sphere radiation method (Kugelstrahlen). This means, for example, a large number of small balls
(Kuegelchen) is performed by blowing compressed air on the surface of the needle roller sleeve from the nozzle with high inertia. This gives the desired stress in relation to certain parameters such as the diameter of the prills, the material of the prills and the impact velocity at the surface of the needle roller sleeve.

Of course, based on the method of claim 9,
It is also possible in principle to manufacture needle roller bearings of the type described above from hollow cylinders formed by cutting.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The needle roller bearing shown in FIGS. 8 and 9 has a bearing sleeve (Lagerhuelse), that is, a needle roller sleeve (Nadelhuelse) 1, and the needle roller sleeves are provided on both end surfaces. It has a collar 2, 18 directed radially inward. The needle roller sleeve 1 has rolling surface curved portions 3 in three circumferential sections that are offset from each other by 120 °. The rolling surface curve 3 is elastically flexurally deformable in the radial direction, so that the shaft 4 is preloaded in three circumferential areas on one side, which comprises one slit 12. This is because the needle roller 6 guided in the container 5 is in contact with both the inner rolling surface 7 and the outer rolling surface 8 in the circumferential area, and the other side is unique to the shaft 4. Movement is possible by overcoming the elasticity due to the rolling surface curve 3. The needle roller sleeve 1 is pressed into the cylindrical bore of the component 10, so that due to the out-of-round shape of the needle roller sleeve, the elastic force between the needle roller sleeve and the component 10 is increased. Three gaps 11 are formed which are important to each other and which are offset from each other. On the basis of the uniform radial width of the collars 2, 18 and the collar, which are consistently connected to the needle roller sleeve 1, over the entire circumference, the needle roller sleeve has the required stability, especially in the region of the gap 11 ( S
tabilita et).

FIG. 1 shows a top bowl formed by a first deep drawing process from a stamped disc (not shown).
2 shows a Ziehteil squeezed product (rmig) 13 having a bottom 14 and a peripheral wall 15 widened at the open end. The rolling surface 8 for the needle rollers (rolling elements) 6 has already been formed by the next molding step. As can further be seen in FIG. 2, the peripheral wall 15 has a thinned wall section at the end 16 on the open side (upper side), which wall section is subsequently flanged. The bottom 14 of the squeezed product 13 is stamped out in the next manufacturing step, so that the squeezed product 13 is formed with the first brim 2 as is apparent from FIG. Then, in the next manufacturing stage shown in FIG.
7 is cut off and the thinned upper end 16 of the peripheral wall 15 is bent radially inwardly, which forms a second collar 18, which, as can be seen from FIG. Lochvorgang) defines the final radial width. As a further step, the drawn product 13 is deformed from the circular shape by using an appropriately configured mother die. This is indicated in FIG. 7 by the markings on the outer peripheral wall. During the deformation process, the master mold has an intermediate circumference (mittlere Durch messer) of the drawn product 13 which is out of a circular shape.
Umfangslinie). This ensures that the collars 2, 18 have a uniform radial width over their entire circumference after permanent deformation of the elastic region. As already mentioned, the collars 2, 18 formed in the aforementioned manner are of great importance for the stability of the bearing, especially in the region of the gap 11. Following the end of the deformation process, the out-of-round needle roller sleeve 1 is martensitic hardened in the usual manner, and then the cage 5 fitted with the needle rollers 6 is needle-shaped. It fits inside the roller sleeve.

[Brief description of drawings]

FIG. 1 is a sectional view of a needle roller sleeve at a manufacturing stage.

FIG. 2 is a sectional view of another stage of manufacturing the needle roller sleeve.

FIG. 3 is a cross-sectional view of another stage of manufacturing the needle roller sleeve.

FIG. 4 is a cross-sectional view of another stage of manufacturing the needle roller sleeve.

FIG. 5 is a sectional view of another stage of manufacturing the needle roller sleeve.

FIG. 6 is a sectional view of another stage of manufacturing the needle roller sleeve.

FIG. 7 is a cross-sectional view of another stage of manufacturing the needle roller sleeve.

8 is a longitudinal sectional view of the needle roller bearing taken along the line I-I in FIG. 9.

FIG. 9 is a cross sectional view of a needle roller bearing.

[Explanation of symbols]

1 needle roller sleeve, 2 collar, 3 rolling surface curved portion, 4 shaft, 5 cage, 6 needle roller, 7, 8
Rolling surface, 10 components, 11 gap, 12
Slit, 13 diaphragm product, 14 bottom part, 15
Peripheral wall, 16 ends, 17 sections, 18 collar

Claims (9)

[Claims] 1. A needle roller bearing for bearing a shaft (4) without play, wherein a thin-walled needle roller sleeve (1) is elastically deflected out of a circle in at least one circumferential section. It has a deformable rolling surface curved portion (3), and at least one of the needle rollers (6) is provided between the rolling surface curved portion (3) and the rolling surface (7) opposite thereto. Radially preloaded, the needle roller sleeve (1) is received in a cylindrical bore (9) and has a flange (2, 18) on its end face directed radially inward. Of the type in which the collar (2, 18) is consistently connected to the end face of the needle roller sleeve (1) and has a uniform radial width despite being out of circular shape. Needle roller bearing characterized by having. 2. The needle roller bearing according to claim 1, wherein the needle roller sleeve (1) has rolling surface curved portions (3) out of a circular shape in three circumferential sections. 3. A needle roller bearing according to claim 1, wherein the needle roller (6) is guided in the cage (5). 4. A method for manufacturing a needle roller bearing, comprising a small bowl shape having one bottom part (14) and one peripheral wall (15) from a disc by a single-step or multi-step deep drawing process. To form a rotationally symmetric drawn product (13), in which the peripheral wall (15) has a reduced wall thickness on the side opposite the bottom (14) and then the bottom (4). Punching out to form the first brim (2),
The peripheral wall (15) is then cut in the area of reduced wall thickness and then the peripheral wall (15) is flanged in the area of reduced wall thickness, whereby the second collar (1
8) is formed and the collar is cut by a piercing process,
Then, after the deformation of the drawn product (13), the cage (5) fitted with the slitted needle rollers (6) is fitted into the needle roller sleeve (1) which is out of the circular shape. In this case, said deformation corresponds to the intermediate circumference of the needle roller sleeve (1) with a deformed intermediate diameter of the rotationally symmetric deep-drawn product (13) and, as a result, the needle A method for manufacturing a needle roller bearing, characterized in that the tapered roller sleeve has a collar (2, 18) of uniform width despite being out of circular. 5. The method according to claim 4, wherein the needle roller sleeve (1) is martensite quenched before the cage (5) is fitted. 6. A method for manufacturing needle roller bearings, comprising a bowl-like shape with one bottom (14) and one peripheral wall (15) from a disc by a single-stage or multiple-stage deep drawing process. To form a rotationally symmetric drawn product (13), in which the peripheral wall (15) has a reduced wall thickness on the side opposite the bottom (14) and then the bottom (4). Punching out to form the first brim (2),
The peripheral wall (15) is then cut in the area of reduced wall thickness and then the peripheral wall (15) is flanged in the area of reduced wall thickness, whereby the second collar (1
8) and then after the deformation of the drawn product (13) into a needle roller sleeve (1) of a non-circular shape, including the needle roller (6) and the cage (5) The sleeve is wholly quenched and in this case the deformation corresponds to the intermediate circumference of the needle roller sleeve (1) with a deformed intermediate diameter of the rotationally symmetrical deep-drawn product (13). And
As a result, a needle roller bearing is manufactured which is characterized in that the needle roller sleeve has a collar (2, 18) having a uniform width in spite of being out of the circular shape. Way for. 7. The method according to claim 4, wherein instead of deep drawing, another manufacturing method without cutting is used, for example pressing or extrusion. 8. The method according to claim 4, wherein the compressive stress of the needle roller sleeve is increased by grinding or radiating after quenching the needle roller sleeve (1). 9. A bottom (4) and a peripheral wall (5).
A hollow cylinder consisting of
5) has a reduced wall thickness on the side opposite to the bottom (14) and then punches out the bottom (4), thereby forming the first collar (2) and then the peripheral wall ( 15) is cut in the area of reduced wall thickness and then the peripheral wall (1
5) By extending the collar in the area where the wall thickness is reduced,
This forms a second collar (18), which is chopped by a piercing process and then slit into a needle roller sleeve (1) which is out of round after the deformation of the hollow cylinder. The retainer (5) with the needle rollers (6) fitted therein, and in this case, the deformation is
The middle diameter of the hollow cylinder corresponds to the middle circumferential line of the deformed needle roller sleeve (1), so that the needle roller sleeve has a uniform width despite being out of circular shape. A method for manufacturing a needle roller bearing, characterized in that it has a collar (2, 18).